float default_value (uint32_t port);
float get_parameter (uint32_t port) const;
uint32_t nth_parameter (uint32_t port, bool& ok) const;
void set_parameter (uint32_t port, float val);
float default_value (uint32_t port);
float get_parameter (uint32_t port) const;
uint32_t nth_parameter (uint32_t port, bool& ok) const;
void set_parameter (uint32_t port, float val);